Find & Post The distance s (in m) above the ground for a projectile fired vertically upward with a velocity of 4[a] m/s as a function of time t (in s ) is given bys = 4 [a] t - 4.9 +2 . Class Your instructor will provide you with a. Simply replace the letter with the corresponding digit. Do not multiply. For example, if [a] = 1, then 4 [a] is 41. Find the answers to these questions. . find t for v = 0 . find v for t = 4 Discussion . find u for t = 5 . What conclusions can you draw? . a=4 and b = 4